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Toner

a technology of toner and triboelectric charge, which is applied in the field of toner, can solve the problems of deterioration of image quality such as uneven solid image and toner scattering, and the inability of toner containing carbon black to have a sufficient level of triboelectric charg

Inactive Publication Date: 2007-07-17
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a toner with a resin binder, a black colorant made of a composite oxide of two or more metals, and a charge control agent made of a quaternary ammonium salt. This toner has improved properties such as better color accuracy and longer-lasting image quality.

Problems solved by technology

Specifically, the toner containing carbon black has a low resistance, so that an appropriate level of triboelectric charge properties cannot be obtained, whereby deteriorations in image qualities such as unevenness of solid images and toner scattering are likely to be generated.
Especially in a high-printing mode in which printed ratio exceeds 20%, the toner consumption is rapid, so that the toner cannot have a sufficient level of triboelectric charges, whereby the toner drop becomes more remarkable.
In addition, in a monocomponent development, since the frictional triboelectric charging time is very short, the toner containing carbon black cannot have a sufficient level of triboelectric charges.
Therefore, there arises undesired phenomena such that the fixed images are blurred during solid-image printing, and that the background fogging is likely to take place.
However, even when the three pigments are mixed together, an appropriate degree of blackness cannot be obtained, and the triboelectric charges are also unstable.
In addition, although the inclusion of the latter composite oxide contained in a toner gives the toner a high triboelectric charge, it is deficient in the stability of the triboelectric charges.
Also, since the degree of blackness is also slightly lower, there arises a problem of lowering the fixing ability when the composite oxide is contained in a large amount in a toner.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

of Resin

[0071]Seven-hundred and thirty five grams of polyoxypropylene(2.2)-2,2-bis(4-hydroxyphenyl)propane, 293 g of polyoxyethylene(2.2)-2,2-bis(4-hydroxyphenyl)propane, 280 g of isophtbalic acid, 60 g of isooctenylsuccinic acid, 72 g of 1,2,4-benzenetricarboxylic acid and 2 g of dibutyltin oxide were reacted at 230° C. under reduced pressure in a nitrogen gas stream atmosphere. The polymerization degree was monitored by the softening point, and the reaction was terminated when the softening point reached 136° C. The resulting resin A was a pale yellow solid having a glass transition point of 63° C., an acid value of 3.1 mg KOH / g and a hydroxyl value of 35.2 mg KOH / g.

preparation example 2

of Resin

[0072]A mixture of 800 g of styrene, 300 g of n-butyl acrylate, and 26 g of dicumyl peroxide was added dropwise to 550 g of xylene under a nitrogen gas atmosphere at 135° C. over 1 hour, and the mixture was further matured for 2 hours. Thereafter, xylene was removed under reduced pressure, to give a resin B. The resin B was a white solid having a softening point of 138° C. and a glass transition point of 65° C.

preparation example 3

of Resin

[0073]Six-hundred and thirteen grams of polyoxypropylene(2.2)-2,2-bis(4-hydroxyphenyl)propane, 244 g of polyoxyethylene(2.2)-2,2-bis(4-hydroxyphenyl)propane, 164 g of terephthalic acid, 177 g of isododecenylsuccinic anhydride, 106 g of 1,2,4-benzenetricarboxylic acid and 3 g of dibutyltin oxide were reacted at 230° C. under reduced pressure under a nitrogen gas stream. The polymerization degree was monitored by the softening point, and the reaction was terminated when the softening point reached 115° C. The resulting resin C was a pale yellow solid having a glass transition point of 61° C., an acid value of 25.3 mg KOH / g and a hydroxyl value of 30.1 mg KOH / g.

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Abstract

A toner comprising a resin binder, a black colorant comprising a composite oxide of two or more metals, and a charge control agent comprising a quaternary ammonium salt. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a toner used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.[0003]2. Discussion of the Related Art[0004]Conventionally, carbon blacks have been widely used as a black colorant for a toner. However, the following problems have been addressed. Specifically, the toner containing carbon black has a low resistance, so that an appropriate level of triboelectric charge properties cannot be obtained, whereby deteriorations in image qualities such as unevenness of solid images and toner scattering are likely to be generated. Especially in a high-speed machine for a two-component development having a linear speed exceeding 370 mm / sec, a centrifugal force applied to the toner by a magnet roller is greater than the Coulomb's force between the toner and the carrier, so that there arises a phenomenon in whic...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03G9/08G03G9/087G03G9/09G03G9/097
CPCG03G9/08755G03G9/0902G03G9/09741
Inventor TACHI, HIDENORIMORIYAMA, SHINJIFUKUSHIMA, YOSHIHIROTAMANE, YASUYUKI
Owner KAO CORP